
export_wp ( $args = array() )
export_wp: 這個函式用來生成一個包含WordPress網站資料的XML檔案,可以用來匯入資料到另一個網站。
生成WXR匯出檔案供下載。
預設行為是匯出所有內容,但是,請注意,只有啟用`can_export`引數的文章型別,才會匯出文章內容。任何具有”自動起草”狀態的文章將被跳過。
function export_wp( $args = array() ) { global $wpdb, $post; $defaults = array( 'content' => 'all', 'author' => false, 'category' => false, 'start_date' => false, 'end_date' => false, 'status' => false, ); $args = wp_parse_args( $args, $defaults ); /** * Fires at the beginning of an export, before any headers are sent. * * @since 2.3.0 * * @param array $args An array of export arguments. */ do_action( 'export_wp', $args ); $sitename = sanitize_key( get_bloginfo( 'name' ) ); if ( ! empty( $sitename ) ) { $sitename .= '.'; } $date = gmdate( 'Y-m-d' ); $wp_filename = $sitename . 'WordPress.' . $date . '.xml'; /** * Filters the export filename. * * @since 4.4.0 * * @param string $wp_filename The name of the file for download. * @param string $sitename The site name. * @param string $date Today's date, formatted. */ $filename = apply_filters( 'export_wp_filename', $wp_filename, $sitename, $date ); header( 'Content-Description: File Transfer' ); header( 'Content-Disposition: attachment; filename=' . $filename ); header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true ); if ( 'all' !== $args['content'] && post_type_exists( $args['content'] ) ) { $ptype = get_post_type_object( $args['content'] ); if ( ! $ptype->can_export ) { $args['content'] = 'post'; } $where = $wpdb->prepare( "{$wpdb->posts}.post_type = %s", $args['content'] ); } else { $post_types = get_post_types( array( 'can_export' => true ) ); $esses = array_fill( 0, count( $post_types ), '%s' ); // phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare $where = $wpdb->prepare( "{$wpdb->posts}.post_type IN (" . implode( ',', $esses ) . ')', $post_types ); } if ( $args['status'] && ( 'post' === $args['content'] || 'page' === $args['content'] ) ) { $where .= $wpdb->prepare( " AND {$wpdb->posts}.post_status = %s", $args['status'] ); } else { $where .= " AND {$wpdb->posts}.post_status != 'auto-draft'"; } $join = ''; if ( $args['category'] && 'post' === $args['content'] ) { $term = term_exists( $args['category'], 'category' ); if ( $term ) { $join = "INNER JOIN {$wpdb->term_relationships} ON ({$wpdb->posts}.ID = {$wpdb->term_relationships}.object_id)"; $where .= $wpdb->prepare( " AND {$wpdb->term_relationships}.term_taxonomy_id = %d", $term['term_taxonomy_id'] ); } } if ( in_array( $args['content'], array( 'post', 'page', 'attachment' ), true ) ) { if ( $args['author'] ) { $where .= $wpdb->prepare( " AND {$wpdb->posts}.post_author = %d", $args['author'] ); } if ( $args['start_date'] ) { $where .= $wpdb->prepare( " AND {$wpdb->posts}.post_date >= %s", gmdate( 'Y-m-d', strtotime( $args['start_date'] ) ) ); } if ( $args['end_date'] ) { $where .= $wpdb->prepare( " AND {$wpdb->posts}.post_date < %s", gmdate( 'Y-m-d', strtotime( '+1 month', strtotime( $args['end_date'] ) ) ) ); } } // Grab a snapshot of post IDs, just in case it changes during the export. $post_ids = $wpdb->get_col( "SELECT ID FROM {$wpdb->posts} $join WHERE $where" ); /* * Get the requested terms ready, empty unless posts filtered by category * or all content. */ $cats = array(); $tags = array(); $terms = array(); if ( isset( $term ) && $term ) { $cat = get_term( $term['term_id'], 'category' ); $cats = array( $cat->term_id => $cat ); unset( $term, $cat ); } elseif ( 'all' === $args['content'] ) { $categories = (array) get_categories( array( 'get' => 'all' ) ); $tags = (array) get_tags( array( 'get' => 'all' ) ); $custom_taxonomies = get_taxonomies( array( '_builtin' => false ) ); $custom_terms = (array) get_terms( array( 'taxonomy' => $custom_taxonomies, 'get' => 'all', ) ); // Put categories in order with no child going before its parent. while ( $cat = array_shift( $categories ) ) { if ( ! $cat->parent || isset( $cats[ $cat->parent ] ) ) { $cats[ $cat->term_id ] = $cat; } else { $categories[] = $cat; } } // Put terms in order with no child going before its parent. while ( $t = array_shift( $custom_terms ) ) { if ( ! $t->parent || isset( $terms[ $t->parent ] ) ) { $terms[ $t->term_id ] = $t; } else { $custom_terms[] = $t; } } unset( $categories, $custom_taxonomies, $custom_terms ); } /** * Wraps given string in XML CDATA tag. * * @since 2.1.0 * * @param string $str String to wrap in XML CDATA tag. * @return string */ function wxr_cdata( $str ) { if ( ! seems_utf8( $str ) ) { $str = utf8_encode( $str ); } // $str = ent2ncr(esc_html($str)); $str = '<![CDATA[' . str_replace( ']]>', ']]]]><![CDATA[>', $str ) . ']]>'; return $str; } /** * Returns the URL of the site. * * @since 2.5.0 * * @return string Site URL. */ function wxr_site_url() { if ( is_multisite() ) { // Multisite: the base URL. return network_home_url(); } else { // WordPress (single site): the blog URL. return get_bloginfo_rss( 'url' ); } } /** * Outputs a cat_name XML tag from a given category object. * * @since 2.1.0 * * @param WP_Term $category Category Object. */ function wxr_cat_name( $category ) { if ( empty( $category->name ) ) { return; } echo '<wp:cat_name>' . wxr_cdata( $category->name ) . "</wp:cat_name>n"; } /** * Outputs a category_description XML tag from a given category object. * * @since 2.1.0 * * @param WP_Term $category Category Object. */ function wxr_category_description( $category ) { if ( empty( $category->description ) ) { return; } echo '<wp:category_description>' . wxr_cdata( $category->description ) . "</wp:category_description>n"; } /** * Outputs a tag_name XML tag from a given tag object. * * @since 2.3.0 * * @param WP_Term $tag Tag Object. */ function wxr_tag_name( $tag ) { if ( empty( $tag->name ) ) { return; } echo '<wp:tag_name>' . wxr_cdata( $tag->name ) . "</wp:tag_name>n"; } /** * Outputs a tag_description XML tag from a given tag object. * * @since 2.3.0 * * @param WP_Term $tag Tag Object. */ function wxr_tag_description( $tag ) { if ( empty( $tag->description ) ) { return; } echo '<wp:tag_description>' . wxr_cdata( $tag->description ) . "</wp:tag_description>n"; } /** * Outputs a term_name XML tag from a given term object. * * @since 2.9.0 * * @param WP_Term $term Term Object. */ function wxr_term_name( $term ) { if ( empty( $term->name ) ) { return; } echo '<wp:term_name>' . wxr_cdata( $term->name ) . "</wp:term_name>n"; } /** * Outputs a term_description XML tag from a given term object. * * @since 2.9.0 * * @param WP_Term $term Term Object. */ function wxr_term_description( $term ) { if ( empty( $term->description ) ) { return; } echo "tt<wp:term_description>" . wxr_cdata( $term->description ) . "</wp:term_description>n"; } /** * Outputs term meta XML tags for a given term object. * * @since 4.6.0 * * @param WP_Term $term Term object. */ function wxr_term_meta( $term ) { global $wpdb; $termmeta = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->termmeta WHERE term_id = %d", $term->term_id ) ); foreach ( $termmeta as $meta ) { /** * Filters whether to selectively skip term meta used for WXR exports. * * Returning a truthy value from the filter will skip the current meta * object from being exported. * * @since 4.6.0 * * @param bool $skip Whether to skip the current piece of term meta. Default false. * @param string $meta_key Current meta key. * @param object $meta Current meta object. */ if ( ! apply_filters( 'wxr_export_skip_termmeta', false, $meta->meta_key, $meta ) ) { printf( "tt<wp:termmeta>nttt<wp:meta_key>%s</wp:meta_key>nttt<wp:meta_value>%s</wp:meta_value>ntt</wp:termmeta>n", wxr_cdata( $meta->meta_key ), wxr_cdata( $meta->meta_value ) ); } } } /** * Outputs list of authors with posts. * * @since 3.1.0 * * @global wpdb $wpdb WordPress database abstraction object. * * @param int[] $post_ids Optional. Array of post IDs to filter the query by. */ function wxr_authors_list( array $post_ids = null ) { global $wpdb; if ( ! empty( $post_ids ) ) { $post_ids = array_map( 'absint', $post_ids ); $and = 'AND ID IN ( ' . implode( ', ', $post_ids ) . ')'; } else { $and = ''; } $authors = array(); $results = $wpdb->get_results( "SELECT DISTINCT post_author FROM $wpdb->posts WHERE post_status != 'auto-draft' $and" ); foreach ( (array) $results as $result ) { $authors[] = get_userdata( $result->post_author ); } $authors = array_filter( $authors ); foreach ( $authors as $author ) { echo "t<wp:author>"; echo '<wp:author_id>' . (int) $author->ID . '</wp:author_id>'; echo '<wp:author_login>' . wxr_cdata( $author->user_login ) . '</wp:author_login>'; echo '<wp:author_email>' . wxr_cdata( $author->user_email ) . '</wp:author_email>'; echo '<wp:author_display_name>' . wxr_cdata( $author->display_name ) . '</wp:author_display_name>'; echo '<wp:author_first_name>' . wxr_cdata( $author->first_name ) . '</wp:author_first_name>'; echo '<wp:author_last_name>' . wxr_cdata( $author->last_name ) . '</wp:author_last_name>'; echo "</wp:author>n"; } } /** * Outputs all navigation menu terms. * * @since 3.1.0 */ function wxr_nav_menu_terms() { $nav_menus = wp_get_nav_menus(); if ( empty( $nav_menus ) || ! is_array( $nav_menus ) ) { return; } foreach ( $nav_menus as $menu ) { echo "t<wp:term>"; echo '<wp:term_id>' . (int) $menu->term_id . '</wp:term_id>'; echo '<wp:term_taxonomy>nav_menu</wp:term_taxonomy>'; echo '<wp:term_slug>' . wxr_cdata( $menu->slug ) . '</wp:term_slug>'; wxr_term_name( $menu ); echo "</wp:term>n"; } } /** * Outputs list of taxonomy terms, in XML tag format, associated with a post. * * @since 2.3.0 */ function wxr_post_taxonomy() { $post = get_post(); $taxonomies = get_object_taxonomies( $post->post_type ); if ( empty( $taxonomies ) ) { return; } $terms = wp_get_object_terms( $post->ID, $taxonomies ); foreach ( (array) $terms as $term ) { echo "tt<category domain="{$term->taxonomy}" nicename="{$term->slug}">" . wxr_cdata( $term->name ) . "</category>n"; } } /** * Determines whether to selectively skip post meta used for WXR exports. * * @since 3.3.0 * * @param bool $return_me Whether to skip the current post meta. Default false. * @param string $meta_key Meta key. * @return bool */ function wxr_filter_postmeta( $return_me, $meta_key ) { if ( '_edit_lock' === $meta_key ) { $return_me = true; } return $return_me; } add_filter( 'wxr_export_skip_postmeta', 'wxr_filter_postmeta', 10, 2 ); echo '<?xml version="1.0" encoding="' . get_bloginfo( 'charset' ) . "" ?>n"; ?> <!-- This is a WordPress eXtended RSS file generated by WordPress as an export of your site. --> <!-- It contains information about your site's posts, pages, comments, categories, and other content. --> <!-- You may use this file to transfer that content from one site to another. --> <!-- This file is not intended to serve as a complete backup of your site. --> <!-- To import this information into a WordPress site follow these steps: --> <!-- 1. Log in to that site as an administrator. --> <!-- 2. Go to Tools: Import in the WordPress admin panel. --> <!-- 3. Install the "WordPress" importer from the list. --> <!-- 4. Activate & Run Importer. --> <!-- 5. Upload this file using the form provided on that page. --> <!-- 6. You will first be asked to map the authors in this export file to users --> <!-- on the site. For each author, you may choose to map to an --> <!-- existing user on the site or to create a new user. --> <!-- 7. WordPress will then import each of the posts, pages, comments, categories, etc. --> <!-- contained in this file into your site. --> <?php the_generator( 'export' ); ?> <rss version="2.0" xmlns:excerpt="http://wordpress.org/export/<?php echo WXR_VERSION; ?>/excerpt/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:wp="http://wordpress.org/export/<?php echo WXR_VERSION; ?>/" > <channel> <title><?php bloginfo_rss( 'name' ); ?></title> <link><?php bloginfo_rss( 'url' ); ?></link> <description><?php bloginfo_rss( 'description' ); ?></description> <pubDate><?php echo gmdate( 'D, d M Y H:i:s +0000' ); ?></pubDate> <language><?php bloginfo_rss( 'language' ); ?></language> <wp:wxr_version><?php echo WXR_VERSION; ?></wp:wxr_version> <wp:base_site_url><?php echo wxr_site_url(); ?></wp:base_site_url> <wp:base_blog_url><?php bloginfo_rss( 'url' ); ?></wp:base_blog_url> <?php wxr_authors_list( $post_ids ); ?> <?php foreach ( $cats as $c ) : ?> <wp:category> <wp:term_id><?php echo (int) $c->term_id; ?></wp:term_id> <wp:category_nicename><?php echo wxr_cdata( $c->slug ); ?></wp:category_nicename> <wp:category_parent><?php echo wxr_cdata( $c->parent ? $cats[ $c->parent ]->slug : '' ); ?></wp:category_parent> <?php wxr_cat_name( $c ); wxr_category_description( $c ); wxr_term_meta( $c ); ?> </wp:category> <?php endforeach; ?> <?php foreach ( $tags as $t ) : ?> <wp:tag> <wp:term_id><?php echo (int) $t->term_id; ?></wp:term_id> <wp:tag_slug><?php echo wxr_cdata( $t->slug ); ?></wp:tag_slug> <?php wxr_tag_name( $t ); wxr_tag_description( $t ); wxr_term_meta( $t ); ?> </wp:tag> <?php endforeach; ?> <?php foreach ( $terms as $t ) : ?> <wp:term> <wp:term_id><?php echo (int) $t->term_id; ?></wp:term_id> <wp:term_taxonomy><?php echo wxr_cdata( $t->taxonomy ); ?></wp:term_taxonomy> <wp:term_slug><?php echo wxr_cdata( $t->slug ); ?></wp:term_slug> <wp:term_parent><?php echo wxr_cdata( $t->parent ? $terms[ $t->parent ]->slug : '' ); ?></wp:term_parent> <?php wxr_term_name( $t ); wxr_term_description( $t ); wxr_term_meta( $t ); ?> </wp:term> <?php endforeach; ?> <?php if ( 'all' === $args['content'] ) { wxr_nav_menu_terms();} ?> <?php /** This action is documented in wp-includes/feed-rss2.php */ do_action( 'rss2_head' ); ?> <?php if ( $post_ids ) { /** * @global WP_Query $wp_query WordPress Query object. */ global $wp_query; // Fake being in the loop. $wp_query->in_the_loop = true; // Fetch 20 posts at a time rather than loading the entire table into memory. while ( $next_posts = array_splice( $post_ids, 0, 20 ) ) { $where = 'WHERE ID IN (' . implode( ',', $next_posts ) . ')'; $posts = $wpdb->get_results( "SELECT * FROM {$wpdb->posts} $where" ); // Begin Loop. foreach ( $posts as $post ) { setup_postdata( $post ); /** * Filters the post title used for WXR exports. * * @since 5.7.0 * * @param string $post_title Title of the current post. */ $title = wxr_cdata( apply_filters( 'the_title_export', $post->post_title ) ); /** * Filters the post content used for WXR exports. * * @since 2.5.0 * * @param string $post_content Content of the current post. */ $content = wxr_cdata( apply_filters( 'the_content_export', $post->post_content ) ); /** * Filters the post excerpt used for WXR exports. * * @since 2.6.0 * * @param string $post_excerpt Excerpt for the current post. */ $excerpt = wxr_cdata( apply_filters( 'the_excerpt_export', $post->post_excerpt ) ); $is_sticky = is_sticky( $post->ID ) ? 1 : 0; ?> <item> <title><?php echo $title; ?></title> <link><?php the_permalink_rss(); ?></link> <pubDate><?php echo mysql2date( 'D, d M Y H:i:s +0000', get_post_time( 'Y-m-d H:i:s', true ), false ); ?></pubDate> <dc:creator><?php echo wxr_cdata( get_the_author_meta( 'login' ) ); ?></dc:creator> <guid isPermaLink="false"><?php the_guid(); ?></guid> <description></description> <content:encoded><?php echo $content; ?></content:encoded> <excerpt:encoded><?php echo $excerpt; ?></excerpt:encoded> <wp:post_id><?php echo (int) $post->ID; ?></wp:post_id> <wp:post_date><?php echo wxr_cdata( $post->post_date ); ?></wp:post_date> <wp:post_date_gmt><?php echo wxr_cdata( $post->post_date_gmt ); ?></wp:post_date_gmt> <wp:post_modified><?php echo wxr_cdata( $post->post_modified ); ?></wp:post_modified> <wp:post_modified_gmt><?php echo wxr_cdata( $post->post_modified_gmt ); ?></wp:post_modified_gmt> <wp:comment_status><?php echo wxr_cdata( $post->comment_status ); ?></wp:comment_status> <wp:ping_status><?php echo wxr_cdata( $post->ping_status ); ?></wp:ping_status> <wp:post_name><?php echo wxr_cdata( $post->post_name ); ?></wp:post_name> <wp:status><?php echo wxr_cdata( $post->post_status ); ?></wp:status> <wp:post_parent><?php echo (int) $post->post_parent; ?></wp:post_parent> <wp:menu_order><?php echo (int) $post->menu_order; ?></wp:menu_order> <wp:post_type><?php echo wxr_cdata( $post->post_type ); ?></wp:post_type> <wp:post_password><?php echo wxr_cdata( $post->post_password ); ?></wp:post_password> <wp:is_sticky><?php echo (int) $is_sticky; ?></wp:is_sticky> <?php if ( 'attachment' === $post->post_type ) : ?> <wp:attachment_url><?php echo wxr_cdata( wp_get_attachment_url( $post->ID ) ); ?></wp:attachment_url> <?php endif; ?> <?php wxr_post_taxonomy(); ?> <?php $postmeta = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->postmeta WHERE post_id = %d", $post->ID ) ); foreach ( $postmeta as $meta ) : /** * Filters whether to selectively skip post meta used for WXR exports. * * Returning a truthy value from the filter will skip the current meta * object from being exported. * * @since 3.3.0 * * @param bool $skip Whether to skip the current post meta. Default false. * @param string $meta_key Current meta key. * @param object $meta Current meta object. */ if ( apply_filters( 'wxr_export_skip_postmeta', false, $meta->meta_key, $meta ) ) { continue; } ?> <wp:postmeta> <wp:meta_key><?php echo wxr_cdata( $meta->meta_key ); ?></wp:meta_key> <wp:meta_value><?php echo wxr_cdata( $meta->meta_value ); ?></wp:meta_value> </wp:postmeta> <?php endforeach; $_comments = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved <> 'spam'", $post->ID ) ); $comments = array_map( 'get_comment', $_comments ); foreach ( $comments as $c ) : ?> <wp:comment> <wp:comment_id><?php echo (int) $c->comment_ID; ?></wp:comment_id> <wp:comment_author><?php echo wxr_cdata( $c->comment_author ); ?></wp:comment_author> <wp:comment_author_email><?php echo wxr_cdata( $c->comment_author_email ); ?></wp:comment_author_email> <wp:comment_author_url><?php echo sanitize_url( $c->comment_author_url ); ?></wp:comment_author_url> <wp:comment_author_IP><?php echo wxr_cdata( $c->comment_author_IP ); ?></wp:comment_author_IP> <wp:comment_date><?php echo wxr_cdata( $c->comment_date ); ?></wp:comment_date> <wp:comment_date_gmt><?php echo wxr_cdata( $c->comment_date_gmt ); ?></wp:comment_date_gmt> <wp:comment_content><?php echo wxr_cdata( $c->comment_content ); ?></wp:comment_content> <wp:comment_approved><?php echo wxr_cdata( $c->comment_approved ); ?></wp:comment_approved> <wp:comment_type><?php echo wxr_cdata( $c->comment_type ); ?></wp:comment_type> <wp:comment_parent><?php echo (int) $c->comment_parent; ?></wp:comment_parent> <wp:comment_user_id><?php echo (int) $c->user_id; ?></wp:comment_user_id> <?php $c_meta = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->commentmeta WHERE comment_id = %d", $c->comment_ID ) ); foreach ( $c_meta as $meta ) : /** * Filters whether to selectively skip comment meta used for WXR exports. * * Returning a truthy value from the filter will skip the current meta * object from being exported. * * @since 4.0.0 * * @param bool $skip Whether to skip the current comment meta. Default false. * @param string $meta_key Current meta key. * @param object $meta Current meta object. */ if ( apply_filters( 'wxr_export_skip_commentmeta', false, $meta->meta_key, $meta ) ) { continue; } ?> <wp:commentmeta> <wp:meta_key><?php echo wxr_cdata( $meta->meta_key ); ?></wp:meta_key> <wp:meta_value><?php echo wxr_cdata( $meta->meta_value ); ?></wp:meta_value> </wp:commentmeta> <?php endforeach; ?> </wp:comment> <?php endforeach; ?> </item> <?php } } } ?> </channel> </rss> <?php }
要使用` get_users
`函式獲取所有使用者列表,可以按照以下步驟進行:
1. 使用` get_users
`函式呼叫獲取使用者列表:
$users = get_users();
2. 您可以按需使用引數來過濾結果。例如,您可以通過角色、使用者ID、使用者登入名等過濾使用者列表。以下是一個根據使用者角色為過濾條件的示例:
$users = get_users( array( 'role' => 'subscriber' // 將角色名稱替換為您要過濾的角色 ) );
在上述示例中,將` role
`引數設定為所需的角色名稱來過濾使用者列表。
3. 您可以使用迴圈遍歷獲取的使用者列表,並訪問每個使用者的屬性。例如,以下示例將顯示每個使用者的使用者名稱和電子郵件地址:
foreach( $users as $user ) { echo '使用者名稱:' . $user->user_login . ', 電子郵件:' . $user->user_email . ; }
在上述示例中,通過` $user->user_login
`和` $user->user_email
`訪問每個使用者的使用者名稱和電子郵件地址。
請注意,` get_users
`函式預設返回所有使用者,並可以根據需要使用更多引數進行過濾。您可以參閱WordPress官方文件中的` get_users
`函式文件,瞭解更多可用引數和用法示例。
總結起來,使用` get_users
`函式獲取所有使用者列表的步驟是:
get_users
`函式獲取使用者列表。在WordPress中,可以使用WP_PLUGIN_DIR和WP_PLUGIN_URL常量來定義外掛的目錄路徑和URL。
1. `WP_PLUGIN_DIR`:這是一個常量,用於定義外掛的目錄路徑(檔案系統路徑)。您可以使用以下程式碼在外掛檔案中訪問該常量:
$plugin_dir = WP_PLUGIN_DIR . '/your-plugin-folder/';
在上述程式碼中,將"your-plugin-folder"替換為您外掛的實際資料夾名稱。使用該常量,您可以獲取外掛檔案的完整路徑。
2. `WP_PLUGIN_URL`:這是一個常量,用於定義外掛的URL(用於在網頁上訪問外掛檔案)。以下是一個使用該常量的示例:
$plugin_url = WP_PLUGIN_URL . '/your-plugin-folder/';
同樣,請將"your-plugin-folder"替換為您外掛的實際資料夾名稱。使用該常量,您可以獲取外掛在網頁上的完整URL。
請注意,`WP_PLUGIN_DIR`和`WP_PLUGIN_URL`常量在WordPress版本2.6之後引入。從WordPress 5.5版本開始,這兩個常量被標記為過時(deprecated),因為WordPress更傾向於使用新的外掛檔案結構。如果您正在開發新外掛,建議使用新的外掛檔案結構和相關函式。
在新的外掛檔案結構中,可以使用以下函式來獲取外掛的目錄路徑和URL:
- `plugin_dir_path()`:獲取外掛目錄路徑。
- `plugin_dir_url()`:獲取外掛URL。
這些函式會自動將外掛的版本、多站點和SSL等考慮因素納入計算。
總結起來,使用`WP_PLUGIN_DIR`和`WP_PLUGIN_URL`常量定義外掛的目錄和URL的方法是:
$plugin_dir = WP_PLUGIN_DIR . '/your-plugin-folder/'; $plugin_url = WP_PLUGIN_URL . '/your-plugin-folder/';
但請注意,這兩個常量已被標記為過時,建議使用新的外掛檔案結構和相關函式來獲取外掛的路徑和URL。
使用PHP在WordPress中新增自定義功能可以通過以下方式實現:
下面是一個實操示例。
要在WordPress中新增自定義功能,可以按照以下步驟使用PHP編寫並新增自定義功能:
// 新增自定義功能示例 // 1. 建立自定義短程式碼 function custom_shortcode() { return '這是我的自定義短程式碼內容'; } add_shortcode('custom', 'custom_shortcode'); // 2. 自定義小工具 function custom_widget() { echo '這是我的自定義小工具內容'; } register_widget('custom_widget'); // 3. 自定義選單 function custom_menu() { register_nav_menu('custom-menu', '自定義選單'); } add_action('after_setup_theme', 'custom_menu'); // 4. 自定義頁面模板 function custom_page_template() { /* Template Name: 自定義模板 */ // 自定義模板的內容和樣式 }
請注意,修改主題檔案可以在主題更新時丟失,因此建議在進行任何更改之前備份functions.php檔案。此外,為避免不必要的錯誤和衝突,建議在新增自定義功能前先了解WordPress開發文件和最佳實踐,以確保正確、安全地實現所需的自定義功能。
使用 do_action
函式可以觸發一個鉤子函式。do_action
函式的引數與要觸發的鉤子函式的引數相同。
例如,觸發save_post鉤子函式的程式碼如下:
do_action( 'save_post', $post_ID, $post );
這裡,$post_ID
和 $post
是傳遞給鉤子函式的引數。
使用 wp_get_current_user
獲取當前登入使用者的資訊:
$current_user = wp_get_current_user(); // 獲取當前使用者的ID $user_id = $current_user->ID; // 獲取當前使用者的使用者名稱 $user_login = $current_user->user_login; // 獲取當前使用者的郵箱 $user_email = $current_user->user_email; // 獲取當前使用者的顯示名稱 $display_name = $current_user->display_name;